Diodes (Led), And Check Pins By Pcb - Canon SmartBase PC1200s Service Manual

CHAPTER 7 TROUBLESHOOTING
6.3 Variable Resistors, Light Emitting Diodes (LED), and
Check Pins by PCB
Of the VRs, LEDs, and check pins used in the machine, those needed when servicing in
the field are discussed:
1. Some LEDs emit dim light even when OFF; this is a normal condition,
and must be kept in mind.
2. VRs that may be used in the field:
VRs that must not be used in the field:
Do not touch the VRs and check pins not found in the lists herein; they are
exclusively for the factory, and require special tools and high accuracy.
6.3.1 Image Processor PCB
J309 J310 J311
J308
JP1: jumper plug for power used by battery to back up memory (control data; user data, service
mode data).
BAT1: battery used to back up memory (SRAM; control data; service mode data, user mode data).
BAT2: battery used to back up memory (SDRAM; fax images)
*1: If equipped with ADF functions
*2: If equipped with fax functions.
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COPYRIGHT © 2001 CANON INC.
J305 J315
*1
J312 J314
BAT2
JP1
J1 BAT1
F07-603-01
2000 2000 2000 2000
J317
J316
VR901
J319
*2
J321
J304
J320
J302 J301
J307
J303
CANON SmartBase PC1200s/iR1200s REV. 0 DEC. 2001
J318
*2
*2